Bộ thử nghiệm Residual Hardness Test Kit, colorimetric, water hardness 0.04-0.15 °d, water hardness 0.05-0.19 °e, 0.7-2.7 mg/L (CaCO₃), MQuant®
water hardness 0.04-0.15 °d, water hardness 0.05-0.19 °e, 0.7-2.7 mg/L (CaCO₃), MQuant®
water hardness 0.04-0.15 °d, water hardness 0.05-0.19 °e, 0.7-2.7 mg/L (CaCO₃), MQuant®